One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,6)(5,7)(9,10,13,16)(11,17,19,14)(12,20,21,15)(18,22,24,23)(25,26,31,36)(27,32,39,47)(28,40,43,33)(29,34,44,50)(30,35,38,46)(37,51,53,45)(41,54,52,48)(42,55,56,49)(9,11,13,19)(10,14,16,17)(12,18,21,24)(15,22,20,23)(25,27)(26,32)(28,41)(29,38)(30,44)(31,39)(33,48)(34,46)(35,50)(36,47)(37,42)(40,54)(43,52)(45,49)(51,55)(53,56)(1,3,5,4)(2,6,7,8)(25,28,29,42,31,43,44,56)(26,33,34,49,36,40,50,55)(27,37,30,41,39,53,38,52)(32,45,35,48,47,51,46,54)(9,12,13,21)(10,15,16,20)(11,18,19,24)(14,22,17,23)(25,29,31,44)(26,34,36,50)(27,38,39,30)(28,42,43,56)(32,46,47,35)(33,49,40,55)(37,52,53,41)(45,54,51,48)(1,4,5,3)(2,6,7,8)(11,19)(14,17)(18,24)(22,23)(25,30,44,27,31,38,29,39)(26,35,50,32,36,46,34,47)(28,41,56,37,43,52,42,53)(33,48,55,45,40,54,49,51)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.